Automatic pawl-trip for horse hay-rakes.



No. 732,861. PATENTED JULY 7, 1903.

E. A. JOHNSTON.

AUTOMAT IG PAWL TRIP FOR HORSE HAY RAKES.

APILIUATION IILBD NOV. 1, 1902.

SHEETSSHBBT1.

HQ MODEL. 1 1 h No. 732,861. PATENTED JULY 7,1903. B. A. JOHNSTON.

AUTOMATIC PAWL TRIP FOB. HORSE HAY RAKES.

APPLICATION FILED NOV. I 1902.

K0 MODEL. 3 SHEETS-SHEET 2.

PATENTED JULY 7. 1903.

E. A.JOHNSTON.

AUTOMATIC PAWL TRIP FOR HORSE HAY RAKES.

H0 MODEL.

APPLIOATION FILED NOV. 1, 1902.

3 SHEETS-SHEET 3.

a citizen of the UnitedStates, residing at Chition of the invention, such as will enable oth- 1 IO againstdanger of accidental and premature of the rake to dump itself isutilized to actuthe parts in the position they assumeduring the load having been discharged, are about .ments in Automatic 'Pawl-Trips' for Horse head carries arock-shaft by means of which the hubs of thewheels whenever it is desired it P U ITED STATES Patented July 1903 PATENT *OFFIcE.

. EDWARD A. JOHNSTON, OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNA TIONAL HARVESTER COMPANY, OF CHICAGO, ILLINOIS, A OORPORA TION OF NEW JERSEY.

.IAUTOMATIC PAWL-TalF FOR HORSE HAY-RAKES.

SPECIFICATION forming part of Letters Patent No. 732,861, dated July7, 1903.

Application filed November 1, 1902.

To all whom it mag concern.-

Beit known thatI, EDWARD A. JOHNSTON,

cago, county of Cook, Stateof Illinois, have invented certain new. and useful Improve- Hay-Rakes; and I do hereby declare the fol lowing to be afull, clear, and exact descripers skilled in the art to which it appertains. to make and use jthesame. p

The invention relates tothat type of draft dumping horse hay-rakes where the rakecertain pawls are made to engage ratchets in to dump the load; and the invention consists in novel means for operating this shaft, so as to throw the pawls into engagement with the revolving ratchets and hold them there disengagement during practically the entire upward movement of the teeth.

The invention also cjomprises an arrangement of dumping-lever and connections with vated or dumping position.

As in my application filed September 24, 1902,Serial No. 124,610, the natural tendency ate the lever which trips the pawl-operating shaft, so as to cause the automatic dumping of the load by simply releasing the pressure of the drivers foot onthe dumping-lever.

. The invention is illustrated in the accompanying drawings, wherein-- Figure 1 is a plan view of part of a horserake embodying my invention. Fig. 2 is a vertical longitudinalsection showing all the parts in their normalworking position. Fig. 3 is a detail View similar to Fig. 2, showing the early part of their movement to dump the load. Fig. 4 is a similar "detailshowing the parts in the position they assume when the teeth have reached their highest position and,

to return to their raking position. Fig. 5 is Serial No. 129,705. (No model.)

an enlarged detail perspective of the ratchetblock, showing its eonstructionf andthe means for securing it to the rake-head.

Referring to the views, at denotes the rake- The rake-head carries, as usual, the rockshaft 7r .for operating the dumping-pawls. The shaft is journaled in bearings l Zon the head, and, as here shown, the pawlsm are formed integrally with the shaft by bending the end of the shaft at right angles and forming a hook thereon, as best shown in Figs. 2 and 3.

About centrally of its length the shaft is has a cranked portion 11, and the trip-lever 0, which is curved, as shown in the drawings and in my other application above referred to, has a curved slot 13 in it through which the cranked portion passes, so that whenever the leveris raised the shaft will be rocked so asto throw thepawls down into engagement with the ratchets on the wheels. lever is pivoted at its forward end to a bracket q, rising from the. rake-frame, and extends The trip ratchets until the highest point in theelevation of the teeth has been reached, when the cranked part n contacts with the front end of the slot in the lever and the shaft is rocked backward, lifting the pawls. positively out of the teeth of the revolving rat-chets. I

As thus far described, there is no novelty claimed herein for the arrangement or construction of any of the parts above referred to, as the present invention relates exclusively to the means for actuating the pawltripping lever and thearrangement of the dumping-lever, which permits the rake-head to be locked with the teeth in their elevated position,as will now be particularly described.

I-Ieretofore this pawl-tripping lever has been operated by various means, and in my applia pair of pawls or triggers s, which extend horizontallyrearward when the teeth are in position and engage the teeth of a ratchetbloek'that is secured to the head a and projects toward the front, so that although the pawls sdo not reach quite to the head they are always aboveit, the ratchet-block being made to project forward, as shown in the drawings, so as to hold the pawls in this elevated position.

The ratchet-block may be secured to the rake-head in line with and under the trip-lever by any suitable means; but in order to insure theaccurate alinement of the block with the pawls s I preferably provide for laterally adjusting the block by connecting it to the head by means of such a bolt-and-slot connectionfor example, as best shown in Fig. 5-where u is an ear or lug projecting from one side of the block and 'u is a slot in the head. A bolt 7 11: passes through a perforation in the lugand has two sets of ratchet-teeth t and F.

slot and is tightened up, so as to firmly secure the block in any desired position, by an ordinary nut.

As clearly illustrated in Fig. 5, the blockt These teeth face toward the front and in opposition to the direction of the point of the pawls, and the teeth in the set 7." are staggered or alternately arranged with those in the set F, so that one pawl engages one set of teeth and the other set is engaged by the other pawl. The object of this duplex arrangement of pawls and staggered teeth is merely to insure auimmediate engagement 'of the rake-head with the means for operating the trip-lever, so that the pawl-operating shaft will be more promptly actuated when the pressure of the foot is taken off the dumping-lever than if only one pawl and set of ratchet-teeth were" employed.

The ratchet-block is quadrant-shaped, as shown in all the figures, and the pawls s are provided at their outer ends with faces 8', that are concaved on an are that is substantially the same as that of the surface of the block. The pawls are also provided with heel projections 8 near their pivots, and

these projections contact with lugs Z on the trip-lever at a certain time to be hereinafter described, and the rear ends of the pawls bear upward against other lugs Z on. the triplever, so that the pawls are in efiect rigid projections for the time being first from one of the lugs and then from the other.

The construction of the tripping arrangement being as thus described, the operation is as follows: When the teeth are down and ready for raking, the normal positions of the head and the tripping-lever are as illustrated in Fig. 2. pawls 8 rest on the ratchet-block, and the tripping lever 0 is held in its normal position by the engagement of the pawls with the lugs Z ward, as it does as soon as the driver takes his foot ofi the dumping-lever, the teeth t and t of the ratchet-block strike the point of the pawls and the trip-lever is carried up with the head. The rear end of the trip-lever of course travels faster than the point where the pawls s are pivoted, and as the upward movement of the head continues the pawls soon separate from the lugs 1 until their concave faces bear on the curved face of the block. At this time the heel s of the pawls contacts with the lugs Z on the trip-lever in front of the pivot of the pawls, and the pawls then become rigid projections from this part of the lever. During the further movement of the head and 11p to the point of highest elevation of the teeth there is no additional elevation of the trip-lever, the concaved face of the pawls simply riding over the convexed face of the ratchetblock, and these 'faces being substantially concentric with the axis on which the head turns; but when the teeth reach the dumping position (see Fig. 4) the block passes from beneath the face of the pawls, and the trip-lever being thus deprived of its support its weight causes it to fall down, as shown in Fig. 4. Just after the pawls pass off the rear end of the ratchetblock the cranked portion of the shaft 01 strikes the front end of the slot in the trip-lever and rocks the shaft n'backward far enough to release the dumping-pawls, and the weight of the trip-lever serves to hold the pawls free from the ratchets until the rake is again ready to be dumped. The rake-head is provided, as usual, with an upstanding bracket a, to which a lever b is secured, by means of which the rake may be dumped by hand. A foot-lever o, hereinafter called the holddown or dumping lever, is also pivotedto the rake-frame within reach of the drivers foot, and this lever is connected to the bracket (1 by means of a link d, so that the dumping of the rake may be controlled by At this time the rear ends of the v When the rake-head starts to rock forthe driver with his foot and the teeth held whatin rear of its front end, so as to leave a portion of the lever in front of the pivot to engage a stops on the lever and form a toggle-lock to hold the raketeethdown when the link d is straightened out and its pivotal points come nearly in line with one another. The upper end of the bracket ct is provided with a series of holes (1?, into any one of which the rear end of the linkmay be fas- 1 Thepower-arm c of the lever is arranged at .20

such an angle (here shown as obtuse) to the work-arm that when the rake-teeth are at their highest elevation the pivotal points between the link and the lever and post a will be so nearlyin line that the teeth will be readily held in their dumping position without the exercise of particular effort, and in order. that the parts may be continuously held in this position there is provided on the link 01 a hook 6 which is freely pivoted to it and hangs down in position to catch and holdthe power-arm of the foot-lever when it is drawn back into the position shown in Fig.

4. This arrangement, therefore, adds to the machine the capacity to have the rake-teethlocked in their dumping position, which will be found to be a great advantage, especially when going from one field to another.

It is to be particularly noted in respect of the automatic dumping arrangement above described that not only is the natural tend- 1 ency to dump quickly imparted to the triplever, but that after the rocking movement of the head has begun it is impossible for the lever to return to its normal position until the dumping operation is completed. The dumping-pawls are thus positively held in engagement with the revolving ratchets until the proper time to release them, and their accidental and premature release is thus effect- 5 ively provided against.

Having thus described my invention, what I claim is 1. Ina wheeled hay-rake, the combination ,.,of the rake-head, the revolving ratchetwheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, and means whereby the natural tendency of the rake to dump itself willimpart to the lever asufficient movement to operate the pawls, said means consisting of a pawl pivoted to the lever, and ratchet-teeth on the rake-head which engage the lever-pawl.

2. In a wheeled hay-rake, the combination of the rake-head, the revolving ratchet wheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, a pair of pawls pivloted to the lever, and two sets of ratchet-teeth on the rake-head in position to engage the pawls, the teeth of the sets being alternately arranged with respect to each other.

3. In a wheeled hay-rake, the combination of the rake head, the revolving ratchetwheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, a pawl pivoted to the lever and having a concave face at its free end, and a ratchet-block secured to the head and having a convex upper surface on whichthe face of the pawl rides.

ing shaft, the trip-lever, a pawl pivoted on the.

lever, a lug on the lever in position to be engaged by the free end of the pawl, and a block on the rake-head having ratchet-teeth to be engaged by the pawl.

6. In a wheeled hay-rake, the combination of the rake head, the revolving ratchetwheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, a pawl pivoted to the lever and having a toe or point and a concave face at its outer end, and a block on the rake head having ratchet-teeth to be engaged by the toe of the pawl, and a convex surface in rear of the teeth for the concave face of the pawl to slide on.

7. In a wheeled hay-rake, the combination 10f the rake-head, the revolving ratchetwheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, and means whereby the natural tendency of the rake todump itself will impart to the lever a sufiicient movement to operate the pawls, said means consisting of a pawl pivoted to the lever in posi- ,tion to be engaged by the head when it starts to rock and which holds the lever in elevated :position until the dumping position of the teeth is reached.

8. In a wheeled hay-rake, the combination of the rake head, the revolving ratchetwheels, the dumping-pawls, the pawl-operating shaft, the trip-lever, and means whereby the natural tendency of the rake to dump itself will impart to the lever a sufiicient movement t'ooperate the pawls, said means consisting of a pawl 'pivotedto the lever in position to be engaged by the head when it starts to rock, and which during the initial movement of the head raises the lever and throws ply holds the trip-lever against falling till the dumping position of the teeth has been ICC reached, the pawl being disengaged and the head may be locked with the raketeeth in [O lever thereby allowed to fall when the rake elevated position. has been dumped. In testimony whereof I affix my signature 9. In a hay-rake, the combination with the in presence of two witnesses.

5 head, of a pivoted bell-crank dumping-lever,

a link connecting the work-arm ot' the lever EDWARD JOHNSTON with the head, and a hook or stop on the link Witnesses: to receive the power-arm of the lever when CHAS. N. CHAMBERS, the rake is in dumping position, whereby the W. M. TWOMBLY. 

